Inflatable mattress



FIG. 1 is a perspective view of an inflatable mattress showing my new design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a side elevational view thereof.

FIG. 4 is a bottom plan view thereof.

FIG. 5 is an end elevational view thereof. 

The ornamental design for an inflatable mattress, as shown and described. 